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{ // no field exists either, throw an exception throw new DataException( Resources.NoSuchValueExistsException + " " + fieldName); } else { // got a field, return its value result = field.GetValue(obj).ToString(); } } else { // found a property, return its value result = prop.GetValue(obj, null).ToString(); } } catch (Exception ex) { throw new DataException( Resources.ErrorReadingValueException + " " + fieldName, ex); } } } return result; } One of the supported data sources is an ADO.NET DataView. A DataView contains a list of DataRowView objects. Because of this, GetField() handles DataRowView objects as follows: DataRowView dataRowView = obj as DataRowView; if (dataRowView != null) { // this is a DataRowView from a DataView result = dataRowView[fieldName].ToString(); } The source list might also be an array of simple values such as int. In that case, a simple value is returned: else if (obj is ValueType && obj.GetType().IsPrimitive) { // this is a primitive value type result = obj.ToString(); } Similarly, the data source might be an array of string data, as shown here: string tmp = obj as string; if (tmp != null) { // this is a simple string result = (string)obj; } If the data source was none of these, then it s a more complex type a struct or an object. In this case, there s more work to do, since reflection must be used to find the property or field

The The Message Processing and State Machines sidebar describes the general pattern of Listing 13-10 and the other MailboxProcessor examples in this chapter, all of which can be thought of as state machines. With this in mind, let s take a closer look at Listing 13-10. First let s use counter on some simple inputs: > counter.Start();; n = 0, waiting... > counter.Post(1);; n = 1, waiting... > counter.Post(2);; n = 3, waiting... > counter.Post(1);; n = 4, waiting... Looking at Listing 13-10, note calling the MailboxProcessor.Start method causes the processing agent to enter loop with n = 0. The agent then performs an asynchronous Receive request on the inbox for the MailboxProcessor; that is, the agent waits asynchronously until a message has been received. When the message msg is received, the program calls loop(n+msg). As additional messages are received, the internal counter (actually an argument) is incremented further. We post messages to the agent using mailbox.Post. The type of mailbox.Receive is as follows:

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runs the server-side data portal components directly within the client process. This class will be covered later in the chapter. When forceLocal is false, the real work begins. First, the proxy string is retrieved from the CslaDataPortalProxy key in the config file by calling the ApplicationContext.DataPortalProxy property. The ApplicationContext class is covered later in the chapter, but this property reads the config file and returns the value associated with the CslaDataPortalProxy key. If that key value is "Local", then again an instance of the LocalProxy class is created and returned. The ApplicationContext.DataPortalProxy method also returns a LocalProxy object if the key is not found in the config file. This makes LocalProxy the default proxy. If some other config value is returned, then it is parsed and used to create an instance of the appropriate proxy class: string typeName = proxyTypeName.Substring(0, proxyTypeName.IndexOf(",")).Trim(); string assemblyName = proxyTypeName.Substring(proxyTypeName.IndexOf(",") + 1).Trim(); _portal = (DataPortalClient.IDataPortalProxy) Activator.CreateInstance(assemblyName, typeName).Unwrap(); In the preceding <appSettings> example, notice that the value is a comma-separated value with the full class name on the left and the assembly name on the right. This follows the .NET standard for describing classes that are to be dynamically loaded. The config value is parsed to pull out the full type name and assembly name. Then Activator. CreateInstance() is called to create an instance of the object. The .NET runtime automatically loads the assembly if needed. The object returned from Activator.CreateInstance() isn t the actual proxy object. Instead, it is an internal .NET object representing the underlying object. The Unwrap() method returns the real proxy object that was dynamically loaded. The final result is that the appropriate proxy object is loaded into memory and returned for use by the code in Csla.DataPortal.

Using an asynchronous receive ensures no real threads are blocked for the duration of the wait. This means the previous techniques scale to many thousands of concurrent agents.

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